This is a vacuum tube that my grandfather used. It was stored in a box, so I think it should still work. Please assess the condition based on the photos. Since I don't have a way to test it, its operation is unconfirmed. Please understand this before purchasing. The appearance is relatively clean. Please judge from the photos. This item is a used product, so please refrain from purchasing if you are sensitive to such things. Cancellations, returns, and refunds are not accepted for any reason after purchase. Price negotiations are not possible.